Abstract
The principles of use of gratings as laser wavelength-selective end reflectors are reviewed. A useful output beam can be derived from a grating’s zeroth-order reflection. This beam moves when the grating is rotated to select various laser wavelengths, but can be made stationary by the addition of auxiliary mirrors. The grating–mirror combination has been applied to a CO2 laser in the ir and to a dye laser in the visible.
© 1970 Optical Society of America
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